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Image Analysis

Decimated and nondecimated 2-D transforms, 2-D dual-tree transforms, shearlets, image fusion, wavelet packet analysis

Analyze images using decimated and nondecimated discrete wavelet and wavelet packet transforms. Use shearlets to create directionally sensitive sparse representations of images with anisotropic features. Perform image fusion.


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wavedec2Multilevel 2-D discrete wavelet transform
waverec2Multilevel 2-D discrete wavelet transform reconstruction
appcoef22-D approximation coefficients
detcoef22-D detail coefficients
haart22-D Haar wavelet transform
ihaart2Inverse 2-D Haar wavelet transform
dualtree2Kingsbury Q-shift 2-D dual-tree complex wavelet transform (Since R2020a)
idualtree2Kingsbury Q-shift 2-D inverse dual-tree complex wavelet transform (Since R2020a)
qbiorthfiltFirst-level dual-tree biorthogonal filters (Since R2020a)
qorthwavfKingsbury Q-shift filters (Since R2020a)
dddtree2Dual-tree and double-density 2-D wavelet transform
idddtree2Inverse dual-tree and double-density 2-D wavelet transform
dtfiltersAnalysis and synthesis filters for oversampled wavelet filter banks
dddtreecfsExtract dual-tree/double-density wavelet coefficients or projections
wrcoef2Reconstruct single branch from 2-D wavelet coefficients
wpdec2Wavelet packet decomposition 2-D
wprec2Wavelet packet reconstruction 2-D
wpcoefWavelet packet coefficients
wprcoefReconstruct wavelet packet coefficients
besttreeBest tree wavelet packet analysis
depo2indNode depth-position to node index
ind2depoNode index to node depth-position
swt2Discrete stationary 2-D wavelet transform
iswt2Inverse discrete stationary 2-D wavelet transform
shearletSystemCone-adapted bandlimited shearlet system (Since R2019b)
sheart2Shearlet transform (Since R2019b)
isheart2Inverse shearlet transform (Since R2019b)
wfusimgFusion of two images
wfusmatFusion of two matrices or arrays
plotdtPlot dual-tree or double-density wavelet transform
wenergy2Energy for 2-D wavelet decomposition
dwtmodeDiscrete wavelet transform extension mode
wavemngrWavelet manager
dyaddownDyadic downsampling
dyadupDyadic upsampling
wcodematExtended pseudocolor matrix scaling
wextendExtend vector or matrix


Wavelet Image AnalyzerDecompose and visualize images (Since R2023a)



Critically Sampled DWT

Nondecimated DWT


Image Fusion

Wavelet Packet Analysis

  • Wavelet Packets
    Use wavelet packets indexed by position, scale, and frequency for wavelet decomposition of 1-D and 2-D signals.